# Obscure Severe Infrarenal Aortoiliac Stenosis With Severe Transient Lactic Acidosis

## TL;DR

A rare case shows that severe leg pain and lactic acidosis can be signs of a dangerous aortic blockage, highlighting the need for quick vascular testing.

## Contribution

Highlights an unusual presentation of infrarenal aortoiliac stenosis with transient lactic acidosis and leg pain.

## Key findings

- Severe lactic acidosis and leg pain can indicate infrarenal aortoiliac stenosis.
- Computed tomography confirmed infrarenal aortoiliac thrombosis in the patient.
- Vascular studies are crucial for timely diagnosis of this condition.

## Abstract

A 57-year-old man presented with sudden onset of leg pain, right-sided weakness, aphasia, confusion, drooling, and severe lactic acidosis (15 mmol/L). He had normal peripheral pulses and demonstrated no pain, pallor, poikilothermia, paresthesia, or paralysis. Empiric antibiotics, aspirin, full-dose enoxaparin, and intravenous fluid were initiated. Lactic acid level decreased to 2.5 mmol/L. The patient was subsequently extubated and was alert and oriented with no complaints of leg or abdominal pain. Unexpectedly, the patient developed cardiac arrest, rebound severe lactic acidosis (8.13 mmol/L), and signs of acute limb ischemia. Emergent computed tomography of the aorta confirmed infrarenal aortoiliac thrombosis. Transient leg pain and transient severe lactic acidosis can be unusual presentations of severe infrarenal aortoiliac stenosis. When in doubt, vascular studies should be implemented without delay to identify this catastrophic diagnosis.